fix(adr-075): CR P0/P1 修補 — TYPE_8M enum + 死碼清理 + docstring 更新

P0-2: NotificationType 新增 TYPE_8M = "TYPE-8M"
      classify_notification 早期回傳 TYPE-8M
      decision_manager 改用 NotificationType.TYPE_8M enum 比較（移除字串字面量）
P1-1: 移除 _CATEGORY_BUTTONS 中不可達的 alertchain_health/flywheel_health 條目
P1-4: test_classify_alert_early.py docstring 更新為 13 條規則/10 分類

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/services/decision_manager.py

@@ -249,7 +249,7 @@ async def _push_decision_to_telegram(
                 resource_name=target[:50],
                 diff_summary=description[:500],
             )
-        elif _notif_type.value == "TYPE-8M" or _alert_category in ("alertchain_health", "flywheel_health"):
+        elif _notif_type == NotificationType.TYPE_8M or _alert_category in ("alertchain_health", "flywheel_health"):
             # TYPE-8M：飛輪/告警鏈路健康異常，發到個人 DM（不發群組）
             tg_result = await gateway.send_meta_alert(
                 incident_id=incident.incident_id,

apps/api/src/services/telegram_gateway.py

@@ -1111,6 +1111,7 @@ class NotificationType(str, Enum):
     TYPE_3      = "TYPE-3"   # 需人工審核（預設）
     TYPE_4      = "TYPE-4"   # AI 無法判斷
     TYPE_4_DRIFT = "TYPE-4D" # Config Drift 專屬
+    TYPE_8M     = "TYPE-8M"  # ADR-075: 飛輪/告警鏈路自身健康（Meta-System）
 
 
 def classify_notification(
@@ -1134,10 +1135,12 @@ def classify_notification(
         decision_state: DecisionState 字串 ("COMPLETED" / "ERROR" / ...)
     """
     # ADR-073 Phase 3-1: 優先採用 classify_alert_early() 已設定的 notification_type
-    # 這樣 TYPE-1/TYPE-4D 告警不需進入 LLM 分析路徑 (2026-04-12 ogt)
+    # 這樣 TYPE-1/TYPE-4D/TYPE-8M 告警不需進入 LLM 分析路徑 (2026-04-12 ogt)
     _early_type = getattr(incident, "notification_type", None)
     if _early_type == "TYPE-4D":
         return NotificationType.TYPE_4_DRIFT
+    if _early_type == "TYPE-8M":
+        return NotificationType.TYPE_8M
     if _early_type == "TYPE-1":
         return NotificationType.TYPE_1
 
@@ -1388,14 +1391,7 @@ class TelegramGateway:
                 ("🔍 查健康狀態", f"action:check_health:{incident_id}"),
                 ("📋 查 Log", f"action:check_log:{incident_id}"),
             ],
-            "alertchain_health": [
-                ("🔍 查 Alertmanager", f"action:check_log:{incident_id}"),
-                ("🔄 重載設定", f"action:reload_config:{incident_id}"),
-            ],
-            "flywheel_health": [
-                ("🔍 查飛輪狀態", f"action:check_health:{incident_id}"),
-                ("📋 查 Log", f"action:check_log:{incident_id}"),
-            ],
+            # alertchain_health / flywheel_health → TYPE-8M → send_meta_alert，不走此字典
             "ai_system": [
                 ("🔀 切換 Provider", f"action:switch_provider:{incident_id}"),
             ],

apps/api/tests/test_classify_alert_early.py

@@ -1,10 +1,14 @@
 """
-classify_alert_early() 分類函數單元測試 — ADR-073 Phase 2-2
+classify_alert_early() 分類函數單元測試 — ADR-073 Phase 2-2 + ADR-075
 
-覆蓋 7 條分類規則的正常路徑與邊界情況：
-  config_drift, info, backup, infrastructure, kubernetes, database, general
+覆蓋 13 條分類規則、10 種告警分類：
+  config_drift (TYPE-4D)
+  alertchain_health, flywheel_health (TYPE-8M) — beats severity
+  info, backup (TYPE-1)
+  host_resource, infrastructure, kubernetes, database,
+  storage, devops_tool, external_site, ssl_cert, general (TYPE-3)
 
-2026-04-12 ogt (ADR-073 P2-2 測試補強)
+2026-04-12 ogt (ADR-073 P2-2 測試補強 + ADR-075 七類新增)
 """
 
 import pytest